What should I wear to a facial/massage tomorrow?

Ok, so oddly I hate padded bras. ( ._.) I still use sports bras and I hate taking off clothes or something infront of strangers, and when I get a facial the woman may massage my back but like, I don't want to wear a sports bra because i'll have to take that off and i'll be completely naked uptown. But since i'm so small padded bras look awkward on me and they're uncomfortable. So I have no idea what to do..Padded bra or sports bra?